Jaw for lathe and drill chucks



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Jaws for La, .and Drill Chucks.

No. 241.926.- Patentd May 24, I881.

UNITED STATES PATENT OFFICE.

FELIX CHILLINGWORTH, OF NEW HAVEN, CONNECTICUT.

JAW FOR LATHE AND DRILL CHUCKS.

SPECIFICATION forming part of Letters Patent No. 241,926, dated May 24, 1881.

Application filed March 24, 1881.

To all whom it may concern:

Be itknown that I, FELIX CHILLINGWORTH, of the city of New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Jaws for Lathe and Drill Chucks, of which the following is a specification.

Chuck-jaws are of three classes those which may not bereversed, those which are of one piece of metal with the nut and must be entirely removed before "reversing, and those which are so constructed and arranged that the jaw proper can be reversed without removing the nut portion from the body of the chuck. It isthe latter class of chuck-jaws to which my invention relates. Heret-ofore such chuck-jaws have been made by drilling holes through the face of the jaw, to permit a threaded stud to pass through, and to be secured in its place by a washer which is fitted to a countersink in the face of the jaw. This method is objectionable for the reason that it reduces the surface of the face of the jaw against which the work should rest, besides making it uneven. The continual strain and pounding produced by the revolution of the chuck when in use must weaken and wear the threads in the washer, thus making the jaw loose and inaccurate. Another objection is that while one of the holes through the jaw is in use the other becomes fouled with dirt and chips, so that much time is lost in cleaning the threads on each occasion when it becomes necessary to reverse the jaw.

The object of my invention is to provide a reversible chuck-jaw that will be substantial, strong, simple in construction, applicable alike toindependent and universal chucks, also free from the complications and objections heretofore existing in reversible chuck-jaws.

The invention consists in a chuck-jaw constructed with a mortise of the proper dimensions to receive a tenon which is made in connection with and is apart of the jaw-nut. The jaw and nut, when connected by the insertion of the tenon in the mortise, are secured together by two dowel or tapered pins, which pass through the mortise and tenon in opposite directions, so that whichever way thejaw may be set in the chuck the first gripe of the (ModeL) jaw will always line with the bite of thejawnut, and the jaw itself can be reversed to accommodate the article to be chucked without losing the full benefit of the long bite in the center. a

In the accompanying drawings, in which similar letters of reference indicate like parts, Figure 1 is a plan view ofthejaw, showing the position of the tenon and tapered pins. Fig. 2 is a side elevation of the same. Fig. 3 is a sectional view through 8 s, Fig. 1. Fig. 4 is a plan view of the nut and-tenon, showing the adjusting-screws.

a is the ob uck-jaw, which is mortised to receive the tenon and drilled to allow the dowelpins to pass through it and bolt the jaw and nut firmly together.

B is the tenon, which is drilled, countersunk, and tapped to receive the adj ustin g-screws c c. The jaw-nut D is connected with the jaw by the tenon when in the mortise, and is held firmly in position by the taper pins 0 0.

The jaws to may be constructed of the same general outward appearance as those in common use, but with the mortise cut or left out on the under side, as shown in Fig. 3. This recess may have round or square ends, as found most convenient in manufacture. The holes for the taper pins should be drilled at the same distance from each end, so that on removing the jaw from the tenon, turning it around, and placing it over the tenon in reverse order, the pin-holes will line perfectly.

The tenon B is made longer than the nutD is wide, and extends out from the top and back of the nut in a parallel line with the threaded hole to support the jaw, and also to receive the radial as well as the annular strain when the chuck is in use. The tenon should fit the mortise perfectly at each end, so that it, and not the pins 0, may receive the strain. The adjusting-screws c 0 should bear against the bottom of the mortise, so that by raising or lowering them they will increase or decrease the draw on the taper pins. This provides a ready means for taking up the wear of the jaw on the chuck-face and enables the mechanic to always keep the jaw tight and free from lost motion.

To reverse the jaw, drive out the pins 0 0,

draw the jaw ofl'the tenon, then turn it around, slide it over the tenon again, drive in the pins, and it will be ready for use.

It is obvious that a good reversible jaw in a chuck must double the value of the tool without increasing the expense to its user.

What 1 claim as new, and desire to secure by Letters Patent, is

1. The combination ofjaw a,mortised as described, with a chuck-jaw nut having an oblong tenonextendingbeyond its width in a line parallel with its threaded hole, and fitting said mortise, substantially as and for the purpose herein shown and described.

2. The combination ofjaw a, mortised as described, with a threaded nut having a tenon fitting said mortise and held in engagement therewith by pins 0 0, in the manner and for the purpose set forth.

3. The combination ofjaw a, mortised as described, with a threaded nut having a tenon fitting said mortise, and held in engagement therewith by pins 0 0, and provided with screws 0, for adjustment with relation to thejaxv, in the manner and for the purposes set forth.

FELIX UHILLINGWORTH.

Witnesses:

NOAH A. FULLERTON, JOHN DOORLEY. 

